Apache HttpClient在高请求/秒下随机延迟 [英] Apache HttpClient random delays under high requests/second

问题描述

我正在使用Apache HttpClient在localhost上查询HTTP / 1.0（不保留）服务器，每秒约有20个POST请求。我有一个TCP_NODELAY启用如下：

I'm using Apache HttpClient to query HTTP/1.0 (without keep alive) server on localhost with around 20 POST requests/second. I have a TCP_NODELAY enabled like this:

val httpParams = new BasicHttpParams()
HttpConnectionParams.setTcpNoDelay(httpParams, true)
val client = new DefaultHttpClient(connectionManager, httpParams)

尽管如此，我每分钟几次看到发送此类请求的随机延迟10-200毫秒（在服务器上显示测量，该延迟在发送中）。我检查过，这不是垃圾收集器暂停。可能是什么问题？

Despite that, several times per minute I see a random delay of 10-200 milliseconds for sending such request (measuring on the server shows, that delay is in sending). I checked, that it's not a garbage collector pause. What can be the problem?

我试图用相同的速率查询服务器与C ++客户端，并且它没有这样的随机延迟，所以我认为它是HttpClient问题。

I tried to query the server with C++ client with the same rate, and it doesn't have such random delays, so i think it's HttpClient problem.

更新：
我检查了jetty HttpClient实现，它有同样的问题。这可能是FreeBSD上JVM的一些问题吗？我应该在linux上测试一下，但我手头没有linux服务器。

Update: I checked jetty HttpClient implementation, and it has the same problem. Can this be some problem of JVM on FreeBSD? I should test this on linux, but I don't have a linux server at hand.

推荐答案

我在这里遇到同样的问题使用Windows。
就我而言，HttpClient引入了大约1秒的延迟，但只是在第一次尝试执行帖子时（我按顺序执行了几次）。我尝试了一种解决方法，即为本地主机创建一个假帖子并执行它（除了IOException）。通过这样做，我在调用实际服务时的延迟从大约1秒减少到大约100毫秒。
我还没有比这更好的改进。

I have the same problem here using windows. In my case, HttpClient was introducing around 1 second of delay but just at the first attempt to execute a post (I do several in sequence). I try a workaround that was to create a "fake" post to the local host and execute it (and except an IOException). By doing that, my delay when calling real services was reduce from around 1 second to around 100ms. I could not improve more than that yet.

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